Hello Daniele,

As you know, I am working on support for aggregation on runtime 
dimension in netcdf. I am now looking into what needs to happen in 
VariableAdaptor.
I am very new at netcdf, so I do not yet understand everything that is 
happening to the fullest extent in this class.

I have found a way to make it work, basically by ignoring the runtime 
dimension altogether. Apart from adding it as an ignored dimension, I 
also had to take into account the possibility of there being four 
dimensions of which one is the runtime dimension.

This is the commit: 
https://github.com/NielsCharlier/geotools/commit/5278115bd43a77c6509881d59a582e69c8bbe182

The aggregation files now pass and I can publish the layers. But I am 
still wondering if this is the right approach. Or should perhaps the 
runtime dimension be treated in the same way as the t- and z-dimensions? 
Or should there  actually be logic in VariableAdaptor for the 
R-dimension, similar to the logic that exists for the Z- and T-dimensions?

What is your opinion? Thanks for your assistance.

Kind Regards,
Niels


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